Latest deals
Insights
FAQs
Price Alerts

Cheap flights from District of Columbia to Ko Samui from $1,057

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from District of Columbia to Ko Samui departing on 9/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from District of Columbia to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:10 pm - 7:10 am
IAD
-
USM
29h 00m
2 stops
Multiple Airlines Logo
5:55 pm - 9:45 am
USM
-
IAD
26h 50m
2 stops
$1,057Multiple Airlines
Wed, Sep 9 - Thu, Sep 17
Multiple Airlines Logo
3:10 pm - 8:25 am
IAD
-
USM
30h 15m
2 stops
Multiple Airlines Logo
7:00 pm - 9:45 am
USM
-
IAD
49h 45m
2 stops
$1,118Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
3:10 pm - 7:10 am
IAD
-
USM
29h 00m
2 stops
Multiple Airlines Logo
10:05 am - 9:45 am
USM
-
IAD
34h 40m
2 stops
$1,148Multiple Airlines
Thu, Sep 10 - Thu, Oct 15
Etihad Airways Logo
3:10 pm - 8:25 am
IAD
-
USM
30h 15m
2 stops
Etihad Airways Logo
5:25 pm - 9:45 am
USM
-
IAD
27h 20m
2 stops
$1,245Etihad Airways
Thu, Aug 20 - Mon, Aug 31
Multiple Airlines Logo
9:00 pm - 10:30 am
IAD
-
USM
26h 30m
2 stops
Multiple Airlines Logo
12:10 pm - 3:40 pm
USM
-
IAD
38h 30m
2 stops
$1,284Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
9:00 pm - 10:30 am
IAD
-
USM
26h 30m
2 stops
Multiple Airlines Logo
12:10 pm - 3:40 pm
USM
-
IAD
38h 30m
2 stops
$1,294Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Etihad Airways Logo
3:10 pm - 11:05 am
IAD
-
USM
32h 55m
2 stops
Etihad Airways Logo
2:35 pm - 9:45 am
USM
-
IAD
30h 10m
2 stops
$1,297Etihad Airways
Thu, Sep 10 - Mon, Sep 14
Cathay Pacific Logo
6:59 pm - 7:40 pm
DCA
-
USM
37h 41m
2 stops
Cathay Pacific Logo
11:55 am - 11:58 pm
USM
-
DCA
47h 03m
2 stops
$1,762Cathay Pacific
Tue, Sep 1 - Mon, Sep 7
Cathay Pacific Logo
6:58 pm - 7:40 pm
DCA
-
USM
37h 42m
2 stops
Cathay Pacific Logo
11:55 am - 5:57 pm
USM
-
DCA
41h 02m
2 stops
$1,812Cathay Pacific
Thu, Sep 10 - Thu, Oct 15
Cathay Pacific Logo
6:59 pm - 7:40 pm
DCA
-
USM
37h 41m
2 stops
Cathay Pacific Logo
11:55 am - 5:59 pm
USM
-
DCA
41h 04m
2 stops
$1,865Cathay Pacific
Tue, Aug 18 - Wed, Aug 26

Etihad Airways flights from District of Columbia to Ko Samui

Our best Etihad Airways deals on District of Columbia to Ko Samui flight tickets
Etihad Airways
Aug 20
IAD3:10 pmWashington, D.C. Dulles Intl
30h 15m
2 stops
USM8:25 amKo Samui
Aug 31
USM5:25 pmKo Samui
27h 20m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,245
Etihad Airways
Sep 10
IAD3:10 pmWashington, D.C. Dulles Intl
32h 55m
2 stops
USM11:05 amKo Samui
Sep 14
USM2:35 pmKo Samui
30h 10m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,297

Cathay Pacific flights from District of Columbia to Ko Samui

Our best Cathay Pacific deals on District of Columbia to Ko Samui flight tickets
Cathay Pacific
Sep 1
DCA6:59 pmWashington, D.C. Reagan-National
37h 41m
2 stops
USM7:40 pmKo Samui
Sep 7
USM11:55 amKo Samui
47h 03m
2 stops
DCA11:58 pmWashington, D.C. Reagan-National
$1,762
Cathay Pacific
Sep 10
DCA6:58 pmWashington, D.C. Reagan-National
37h 42m
2 stops
USM7:40 pmKo Samui
Oct 15
USM11:55 amKo Samui
41h 02m
2 stops
DCA5:57 pmWashington, D.C. Reagan-National
$1,812
Cathay Pacific
Aug 18
DCA6:59 pmWashington, D.C. Reagan-National
37h 41m
2 stops
USM7:40 pmKo Samui
Aug 26
USM11:55 amKo Samui
41h 04m
2 stops
DCA5:59 pmWashington, D.C. Reagan-National
$1,865

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 2, 2026.
Use the filters below to find and compare flights from District of Columbia to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 9/9

3:10 pm-7:10 am

2 stops29h 00m

Ko Samui

Thu 9/17

5:55 pm-9:45 am

2 stops26h 50m

$1,057

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 9/1

3:10 pm-8:25 am

2 stops30h 15m

Ko Samui

Mon 9/7

7:00 pm-9:45 am

2 stops49h 45m

$1,118

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/10

3:10 pm-7:10 am

2 stops29h 00m

Ko Samui

Thu 10/15

10:05 am-9:45 am

2 stops34h 40m

$1,148

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 8/20

3:10 pm-8:25 am

2 stops30h 15m

Ko Samui

Mon 8/31

5:25 pm-9:45 am

2 stops27h 20m

$1,245

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 9/21

9:00 pm-10:30 am

2 stops26h 30m

Ko Samui

Mon 9/28

12:10 pm-3:40 pm

2 stops38h 30m

$1,284

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 9/21

9:00 pm-10:30 am

2 stops26h 30m

Ko Samui

Mon 9/28

12:10 pm-3:40 pm

2 stops38h 30m

$1,294

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/10

3:10 pm-11:05 am

2 stops32h 55m

Ko Samui

Mon 9/14

2:35 pm-9:45 am

2 stops30h 10m

$1,297

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 9/1

6:59 pm-7:40 pm

2 stops37h 41m

Ko Samui

Mon 9/7

11:55 am-11:58 pm

2 stops47h 03m

$1,762

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 9/10

6:58 pm-7:40 pm

2 stops37h 42m

Ko Samui

Thu 10/15

11:55 am-5:57 pm

2 stops41h 02m

$1,812

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 8/18

6:59 pm-7:40 pm

2 stops37h 41m

Ko Samui

Wed 8/26

11:55 am-5:59 pm

2 stops41h 04m

$1,865

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

See travel insights to Ko Samui from

How to get the cheapest flight ticket from District of Columbia to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from District of Columbia to Ko Samui?

EVA Air is the most popular carrier operating from District of Columbia to Ko Samui

Cheap District of Columbia to Ko Samui flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from District of Columbia to Ko Samui

Fastest flight time

26h 30m

Direct flights

None
The fastest flight from District of Columbia to Ko Samui takes 26h 30m
There are no direct flights from District of Columbia to Ko Samui. There are no popular flight routes from District of Columbia to Ko Samui.
Search flight deals

Frequently asked questions about flying from District of Columbia to Ko Samui

  • When did momondo last update prices for flights from District of Columbia to Ko Samui Airport?

    Prices for flights from District of Columbia to Ko Samui Airport refresh daily.

  • How old do you have to be to fly from District of Columbia to Ko Samui Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from District of Columbia to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from District of Columbia to Ko Samui?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from District of Columbia to Ko Samui. momondo saves you time and could save you money on your trip.

Can I find flights from District of Columbia to Ko Samui with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Ko Samui from District of Columbia with this policy.

How can momondo help me find flights from District of Columbia to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from District of Columbia.

I’m not ready to book a flight from District of Columbia to Ko Samui right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of District of Columbia to Ko Samui flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 7/2
Thu 7/9
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand